One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,5,6)(3,7,4,8)(9,10)(11,15)(12,14)(13,16)(19,25)(22,31)(26,32)(27,29)(2,6)(7,8)(11,16)(13,15)(17,18)(19,26)(20,28)(21,23)(22,27)(24,30)(25,32)(29,31) involution — undirected(1,3,5,4)(2,7,6,8)(9,11,12,16)(10,13,14,15)(17,18)(19,22)(20,24)(21,23)(25,31)(26,27)(28,30)(29,32)(10,14)(13,15)(17,19,21,25)(18,22,23,31)(20,29,30,27)(24,32,28,26)(1,4,5,3)(2,7,6,8)(18,23)(22,31)(24,28)(26,32)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.